[1] Originally starting with Quake II, Kaasjager later rose to widespread popularity with the release of a self-made highlight montage (or "frag video") from the game Challenge ProMode Arena,[2] which showcases his unique aggressive style of playing.

[5] When the Cyberathlete Professional League, World Series of Video Games, and other tournaments dropped Painkiller in favor of Quake 4, Kaasjager took a break from professional gaming starting from June 21, 2006, to pursue his studies for the upcoming college semester.

After retiring, he has been known to play Challenge ProMode Arena, Warsow,[6] QuakeWorld, Quake Live, and evading Thunderfury binding drops.

In 2017, at age 32, Kaasjager returned from retirement and finished in second place at the Quake World Championship 2017.

[5][9] He attended the University of Texas at Dallas and was a member of the Texas-Dallas Comets men's tennis team.